Jon Brower Minnoch (1941 - 1983) of Bainbridge Island, WA; 6 ft 1 in, estimated as weighing "probably more than" 1400 lbs in 1979, at which point it took 13 people just to roll him over in bed. Minnoch, like many of the heaviest people, suffered from massive edema: his weight was augmented by at least 900 lbs of fluid at its peak.
The former taxi driver had always been unusually heavy, reaching 400 lbs in 1963, 700 lbs in 1966, and 975 lbs in 1976, but he claimed to have been in no way handicapped by his size until a 500-calorie diet sapped his muscle strength and left him at the brink of death.
At his peak in 1978 Jon Brower Minnoch tipped the scales at an estimated 635 kilograms or 1397 pounds or if you prefer 100 stone. At this point he finally went on a diet losing almost 2/3 of his weight before putting some back on. Subsequent hospitalization brought him down to 476 lbs in 1981, mostly through the loss of 12 to 14 pounds of fluid per week. He was readmitted later that year after regaining 200 lbs in seven days.
Although physicians at University Hospital in Seattle persisted in treating him with a 1,200-calorie diet, he weighed about 800 lbs at the time of his death.